On the Cretaceous Flora of Enssian S;ikhalin. 



35 



10. Sagenopteris variabilis (Vel.) Velexovsky. 



1885. ThinnfekUa variabilis, Velexovsky, Die Gymnosixjrmen der bobmischen 



Kreideformation, p. 6, pb II, f. 1-5 ; III, f. 12. 

 1889. Sagenopteris variabilis, Velexovsky, Kvetena ëeskebo Cenoinami, p. 40. 



1902. Tliinnfeldia variabilis, Hollick, Geological and Botanical notes : Cape 

 Cod and Cbappaquidick Island, ]Mass., p. 403, pi. XLI, f. 12. 



1903. Thinnfeldia variabilis, Berry, The American Species referred to Tbinn- 

 feldia, p. 444. 



1906. Sagenopteris variabilis, Hollick, Cretaceous Flora of Soutb Xew York 

 and Xew England, p. 34, pi. I, f. 22. 



Locality : Sea-shore at Mgacb. 



We found, from this locality, 

 several complete leaflets of this fern, 

 4.5 to 2.5 cm. in length. Two of them 

 are nearly quite symmetrical; the 

 bigger one is oblanceolate, tapering 

 slowly toward the base. The median 

 nerve of the same is distinct only a 

 little above the middle of the whole 

 fength. In tw^o other small leaflets 

 the midrib is very slender and slightly 

 apparent only at the base. The lateral veins, which are close to- 

 gether, advance under an acute angle and anastomose into a net- 

 work with elongate meshes. Another leaflet with an obliquely 

 cut top does not show any trace of the midrib, just as shown in 

 figs. 3 and 4 of Velenovsky (I. c). 



The species shows the following relations to the most common 

 Cretaceous species. It is enth^ely different from Sagenopteris ellip- 

 tica FoNT.,'^ which has long acute -lanceolate leaflets, with a rela- 



Fig. 5. 



Sagenopteris variabilis (Vel.) Velen. 



1) Fontaest: (1889), p. 149, pi. XXVU, f. 9, 11-17. 



